diff options
| author | Nicholas Mc Guire <hofrat@osadl.org> | 2016-12-16 04:59:38 +0300 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2016-12-16 12:22:01 +0300 |
| commit | 15a43cbf4736a3932e6259fa7d6e47558f6222b0 (patch) | |
| tree | 34f1988e4d79e76155b0c2a0379bdf5e126f40be /drivers/gpu/drm/i915/intel_dsi_pll.c | |
| parent | 0a7b35ce2e7a8744ff2b7689f09bd4f5e00e77f1 (diff) | |
| download | linux-15a43cbf4736a3932e6259fa7d6e47558f6222b0.tar.xz | |
drm/i915: relax uncritical udelay_range()
udelay_range(1, 2) is inefficient and as discussions with Jani Nikula
<jani.nikula@linux.intel.com> unnecessary here. This replaces this
tight setting with a relaxed delay of min=20 and max=50 which helps
the hrtimer subsystem optimize timer handling.
Fixes: commit be4fc046bed3 ("drm/i915: add VLV DSI PLL Calculations")
Link: http://lkml.org/lkml/2016/12/15/147
Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1481853578-19834-1-git-send-email-hofrat@osadl.org
Diffstat (limited to 'drivers/gpu/drm/i915/intel_dsi_pll.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dsi_pll.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/intel_dsi_pll.c b/drivers/gpu/drm/i915/intel_dsi_pll.c index cf8c1b0c30d6..61440e5c2563 100644 --- a/drivers/gpu/drm/i915/intel_dsi_pll.c +++ b/drivers/gpu/drm/i915/intel_dsi_pll.c @@ -156,8 +156,10 @@ static void vlv_enable_dsi_pll(struct intel_encoder *encoder, vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, config->dsi_pll.ctrl & ~DSI_PLL_VCO_EN); - /* wait at least 0.5 us after ungating before enabling VCO */ - usleep_range(1, 10); + /* wait at least 0.5 us after ungating before enabling VCO, + * allow hrtimer subsystem optimization by relaxing timing + */ + usleep_range(10, 50); vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, config->dsi_pll.ctrl); |